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14.000  Articles
1 of 1.400 pages  |  10  records  |  more records»
The study presents an analysis of long-term trends in terminal celibacy and primary infertility in South Africa. Sources of data were four population censuses conducted in 1996, 2001, 2007 and 2011, which cover cohorts of women born between 1900 and 1971 ... see more

The study uses data from eight censuses conducted between 1970 and 2011 to reconstruct long term trends in terminal celibacy in South Africa. The cohort analysis covers those born between 1870 and 1971. Results show a quasi-stable prevalence of terminal c... see more

Background: The study investigates the median age at menarche in African countries.Data Source and Methods: DHS surveys provided information on the proportion ever-menstruating among women age 15-19. A linear-logistic regression model was used to derive t... see more

The study documents cases of extremely high fertility in sub-Saharan Africa. The DHS surveys were used for the analysis, with straightforward calculations of period and cohort fertility. Two case studies were further analysed: Kenya (1965-69) and Niger (1... see more

Abstract The paper presents and discusses the progress in knowledge of African populations and their dynamics over the past 50 years. It takes as a starting point the landmark series of studies published in The Demography of Tropical Africa. Since then ma... see more

A comparative study of fertility trends since 1950 in 30 countries from sub-Saharan Africa revealed several cases of “fertility stall”, that is a change from downward fertility trends to flat- or even slightly rising- trends for some time, usual... see more

Queste pagine sono tratte dall’opera principale di Michelstaedter, La persuasione e la rettorica, che si dichiara già nelle pagine introduttive, aspirante a «dignità filosofica» e a «concretezza artistica» . Pensieri e astrazioni si presentano in un lingu... see more

Melanin is generally known as a protector of human skin against radiation. However, the excessive production of melanin induces hyperpigmentation and other skin disorders. Arbutin, kojic acid, and hydroquinone have been used as inhibitors for tyrosinase w... see more

Nascido em Porto Alegre em 1973, atualmente Michel Laub reside na cidade de São Paulo. Sendo escritor e jornalista, atua como colunista no Valor Econômico, além de colaborar com diversas editoras e veículos, escrevendo seus romances entre um e outro traba... see more

1 of 1.400 pages  |  10  records  |  more records»